#638D18#638D18

#638D18 is a mid, vivid yellow-green. Relative luminance 0.218; OKLCH L 59.1% C 0.146 H 128.4°. Best body text is #000000 at 5.35:1 contrast (WCAG AA passes).

Color values

HEX	#638D18
RGB	rgb(99, 141, 24)
HSL	hsl(82, 71%, 32%)
HSV	hsv(82, 83%, 55%)
CMYK	cmyk(29.8%, 0%, 83%, 44.7%)
CIE-LAB	lab(53.78, -31.57, 52.29)
CIE-LCH	lch(53.78, 61.08, 121.12°)
OKLab	oklab(59.09% -0.0908 0.1145)
OKLCH	oklch(59.09% 0.146 128.4)
XYZ	xyz(14.8353, 21.7680, 4.2840)
Luminance	0.2177 (WCAG relative)
Temperature	warm
Family	yellow-green

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#638D18 #42188D

analogous

#8D7C18 #638D18 #298D18

triadic

#638D18 #18638D #8D1863

tetradic

#638D18 #188D7C #42188D #8D1829

square

#638D18 #188D7C #42188D #8D1829

split-complementary

#638D18 #18298D #7C188D

monochromatic

#1A2406 #3E590F #638D18 #88C121 #A6DF41

Accessibility & contrast

On white

3.92

#638D18 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.35

#638D18 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #638D18

5.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##638D18	#FFFFFF	#000000	##000000
##638D18	1.00	3.92	5.35	5.35
#FFFFFF	3.92	1.00	21.00	21.00
#000000	5.35	21.00	1.00	1.00
##000000	5.35	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#948200

Deuteranopia (green-blind)

#8F8025

Tritanopia (blue-blind)

#678678

Achromatopsia (no color)

#808080

Design tokens & code

CSS

--color: #638d18;
/* rgb */ color: rgb(99, 141, 24);
/* oklch */ color: oklch(59.1% 0.146 128.4);

Tailwind

colors: {
  custom: {
    50: '#94ae61',
    500: '#638d18',
    950: '#000000',
  },
}

SCSS

$custom: #638d18;
$custom-light: #94ae61;
$custom-dark: #000000;

JSON

{
  "hex": "#638d18",
  "rgb": {
    "r": 99,
    "g": 141,
    "b": 24
  },
  "hsl": {
    "h": 81.538,
    "s": 70.909,
    "l": 32.353
  },
  "oklch": {
    "l": 0.59092,
    "c": 0.14616,
    "h": 128.4
  },
  "luminance": 0.21768
}

Semantic roles & 50–950 ramp

primary

#638D18

secondary

#6F42BF

accent

#3AEE7B

background

#F9FAF6

surface

#F2F4EB

border

#CCCEC6

text

#0E1005

muted

#7E7F7A

Preview Lab

Preview with #638D18

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →